Long-term bar dynamics using satellite imagery
A case study at Anmok beach, South Korea
Panagiotis Athanasiou (University of Twente, Deltares)
W.P. de Boer (Deltares, TU Delft - Rivers, Ports, Waterways and Dredging Engineering)
Pieter Koen Tonnon (Deltares)
Jeseon Yoo (Korean Institute of Ocean Science and Technology)
M.A. de Schipper (TU Delft - Coastal Engineering)
S. de Vries (TU Delft - Coastal Engineering)
Roshanka Ranasinghe (University of Twente, TU Delft - Coastal Engineering, Deltares)
A.J.H.M. Reniers (TU Delft - Environmental Fluid Mechanics)
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Abstract
Nearshore sandbar patterns can affect the hydrodynamics and, as a result, the beach morphodynamics in the nearshore zone. Hence, spatial and temporal variability in the sandbars can influence beach accretion and erosion. Understanding the variability of the sandbar system can therefore be crucial for informed coastal zone management. So far, the methods to study sandbar dynamics mainly include datasets of video observations or occasional bathymetric surveys. However, at most locations around the world, these types of data are not or only scarcely available. In this paper we present an alternative method to analyze long-term sandbar variability by means of freely available satellite imagery. These images are globally available since the 1980’s and, thus, have the potential to be applicable at any location in the world. Here, we will illustrate the methodology by means of a case study at Anmok beach at the South Korean East coast.